Safety-fuse for electric circuits.



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SAFETY FUSE PGP- 'ELETR GRGUITS:

PPLXOATI FILED JAH. i5. 1G04.

v UNITED STATEs Patented January 31, 1905 PATENT OFFICE.

i CHRISTIAN KRAMER, or NEUISENBURG, GERMANY. AssieNoR To SOCIETY orAELEKreizirATsAitiiics-erasELLseiiAFfr vomi.l w. LAHunYiciz e oriuaAiuiFoirroN-'riii-MAIN,l GERMANY. y

SAFETY-FUSE Fos ELCTRIC chacun-s.'4

To all whom it muy concern:

l :."Be it known that I, liiRis'rIAN KRAMER, a

.subject o1 tlie German Emperor, residing and having mypost-ofiiceaddress at Kaiserstrasse 5 156g ,Neu-Isenburg, Hessia, Germany, haveinvented certain new and useful Improvements in Safetylfusesv forElectric Circuits, of which the following is a specification. Thisinvention relates to'. safety-fuses for i lectric-,gireuits, andespeciallyY adapted for use in high-potential circuits.

rlhe object of the invention is to provide a fuse-holder which resiststhe most powerful force exerted on disruption ofthe fuse proper,

I the resulting gases, which might cause lthe formation of an arc.passing into oil or other insulating liquid. The wire or stripconstituting the fuse .proper is protected against contactl with the oilor other insulating liquid,44 20 and the parts of different polarity areafter tube2-is' the wire or strip 3, constituting the' fuse proper\vliich is soldered at its lower end toa contact-pieie .or electrode4, its upper part being passed through a fine hole in th'e 40containeunl, which is formed with a piece constituting the othercontact-piece or velectrode, to'whieh the upper enil of the wire orstrip is secured. '.lhe device constituted by the fuse and-its containerthus constructed are introduced into a vessel containing oil or otherinsulating liquidV so that the fuse wire or strip 3 doesnot dip into theoil or other insulatingliquid. 1f the container be made i sPEcImoA'rioNforming part @Letters Parent No. 781,347, dacedaamiary 31, 1905.

Application tiled January 5, 1904. Sterial Nq. 187,818. i

pressure created forcibly propels theleontactpiece or electrode 4 intothe oil or other insulating liquid, the explosion-gases passing throughthe tube 2 into the oil or othei insulating'liquid. wherebyth'eyarecooled. The

'two poles of the fuse become thus separated `165 by a layer of oil orother insulating liquid as soon as the fuse is melted. If desired, theaction of the explosion mayI be assisted bysuitably proportioning thespringeonnected -to the contact-piece or electrode .4. ^7- i l claim- 1.The combination witha bath of insulating liquid of a fuse, a movableelectrode, and means whereby the pressure created by the fusing of saidfuse operates to force said elect-rode beneath the surface of saidliquid, substantially as described.

2. The combination with an insulating-bath, of a container openingbeneath the surface o f said bath, said container beingotherwise 8Oclosed, and a fuse mounted in said container, substantially asdescribed.

The combination with an insulating-bath, of a container forming anelectrode,.said container opening beneath the surface of said bath butbeing otherwise closed, and a fuse mounted in said container,substantially as described.

4. The combination with an insulatingfbath, of a container forming anelectrode, said containcr opening beneath the surface of said bath butbeing otherwise closed, an insulatinglining for said container, and afuse mounted within said container, substantiallyas' described. -9'lhecombinationwithaninsulating-bath,

.of s. container forming an electrode, saidcontainerV opening"lbeneeth'the surface o'snid -bat-h but being otherwise closed, aninsulatingae described.

connected to said contact-piece, s ubetentally,

6. Theconibination with an insulating-bath', of a container forming anelectrode` said cong temer opening beneathptlie 4surface o sind l bathbut. being otherwise closed, an insulatinglining for said container, amovable 'centaict` piece engagingy with'the .interior of said container,and a tuse mounted within said container, and connected to sind movablecontactpiece, Suimtantially as. described.

7. i The combination with an vinsulziti nglbath,

' of n -containensaid containeropening beneath `the Surfaceiof. Saidbath `but bcin'g otherwise' rclosed;'anmeuliitingflimng for saidcontainer,

a movable contact-pie'ceproJectmg above the f K l. -surfaiceofgsnid bath.withinlsaid continer and l engaging with said insulating-lining, afuse( i mounted within .said container and connected to saidi containerand said movable contactpiece seid fuse being wholly wit-hout the bath,,substantially as described.

8. The combination with a bath of insulating liquid` of a containeropening beneath the surface of said liquid', said container beingotherwise closed, a movable contact-piece projecting into said containerabove the surface of said liquid and afuse mounted in said containerthe'whole being so constructed and arranged that the pressure created bythe fusing ofsaid fuse forces said electrode beneath the surface of saidbath, substantially es de- In testimony whereof l have signed my name to`this specificationin the presence of two subl scribin,f r witnesses. Ay

" 1 CHRISTIA KRAMER.

Witnesses:

ERwrN DEPPEL, JEAN GRUND.

